I loved that moment! It actually startled me more the second time, strangely. I had forgotten about it, then "Fluttershy" walks over to Twilight and I'm like "I don't remember her looking so..." and I was still deciding between angry and determined when she suddenly pulled the costume off and I was like "AH! OH MY- Oh right, I forgot all about that."

But even better is Fluttershy being scared of the empty costume! It just cracks me up for some reason!

Wow... Pinkie, you never fail to be completely random. I don't think anyone saw that coming! If I were Fluttershy, that would be my reaction, too. How did Pinkie even do that? Oh wait... It's Pinkie. You can't explain her. Does that mean Pinkie could go around doing perfect impersonations of her friends in suits that look exactly like them?